Integrate offline support and improve error handling across app

- Add `OfflineContext` to manage offline state and interactions within components.
- Refactor session logic in `ScribeControllerBar` and `page.tsx` to handle offline scenarios (e.g., check connectivity before enabling GPT features).
- Enhance offline PIN setup and verification with better flow and error messaging.
- Optimize database IPC handlers to initialize and sync data in offline mode.
- Refactor code to clean up redundant logs and ensure stricter typings.
- Improve consistency and structure in handling online and offline operations for smoother user experience.

electron.d.ts

@@ -11,7 +11,7 @@ export interface IElectronAPI {
   platform: NodeJS.Platform;
 
   // Generic invoke method - use this for all IPC calls
-  invoke: <T = any>(channel: string, ...args: any[]) => Promise<T>;
+  invoke: <T>(channel: string, ...args: any[]) => Promise<T>;
 
   // Token management (shortcuts for convenience)
   getToken: () => Promise<string | null>;